alt Hacker NewsAgreed -- not my wheelhouse, but couldn't you just build rust earlier in your process using LLD, then build mold, then build everything else?
Would that meant that building rust is slower, but everything else is the same, and you don't have to maintain a fork of another complex project?
Rust requires python and perl and musl and openssl and 80% of the entire wall time of building the whole tree.
Rust is the single most expensive thing to bootstrap in any given linux distro.
It is the thing you need mold the most for to speed things up.